18c2ecf20Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */ 28c2ecf20Sopenharmony_ci#ifndef _SELFTESTS_POWERPC_BASIC_ASM_H 38c2ecf20Sopenharmony_ci#define _SELFTESTS_POWERPC_BASIC_ASM_H 48c2ecf20Sopenharmony_ci 58c2ecf20Sopenharmony_ci#include <ppc-asm.h> 68c2ecf20Sopenharmony_ci#include <asm/unistd.h> 78c2ecf20Sopenharmony_ci 88c2ecf20Sopenharmony_ci#define LOAD_REG_IMMEDIATE(reg, expr) \ 98c2ecf20Sopenharmony_ci lis reg, (expr)@highest; \ 108c2ecf20Sopenharmony_ci ori reg, reg, (expr)@higher; \ 118c2ecf20Sopenharmony_ci rldicr reg, reg, 32, 31; \ 128c2ecf20Sopenharmony_ci oris reg, reg, (expr)@high; \ 138c2ecf20Sopenharmony_ci ori reg, reg, (expr)@l; 148c2ecf20Sopenharmony_ci 158c2ecf20Sopenharmony_ci/* 168c2ecf20Sopenharmony_ci * Note: These macros assume that variables being stored on the stack are 178c2ecf20Sopenharmony_ci * doublewords, while this is usually the case it may not always be the 188c2ecf20Sopenharmony_ci * case for each use case. 198c2ecf20Sopenharmony_ci */ 208c2ecf20Sopenharmony_ci#if defined(_CALL_ELF) && _CALL_ELF == 2 218c2ecf20Sopenharmony_ci#define STACK_FRAME_MIN_SIZE 32 228c2ecf20Sopenharmony_ci#define STACK_FRAME_TOC_POS 24 238c2ecf20Sopenharmony_ci#define __STACK_FRAME_PARAM(_param) (32 + ((_param)*8)) 248c2ecf20Sopenharmony_ci#define __STACK_FRAME_LOCAL(_num_params, _var_num) \ 258c2ecf20Sopenharmony_ci ((STACK_FRAME_PARAM(_num_params)) + ((_var_num)*8)) 268c2ecf20Sopenharmony_ci#else 278c2ecf20Sopenharmony_ci#define STACK_FRAME_MIN_SIZE 112 288c2ecf20Sopenharmony_ci#define STACK_FRAME_TOC_POS 40 298c2ecf20Sopenharmony_ci#define __STACK_FRAME_PARAM(i) (48 + ((i)*8)) 308c2ecf20Sopenharmony_ci 318c2ecf20Sopenharmony_ci/* 328c2ecf20Sopenharmony_ci * Caveat: if a function passed more than 8 doublewords, the caller will have 338c2ecf20Sopenharmony_ci * made more space... which would render the 112 incorrect. 348c2ecf20Sopenharmony_ci */ 358c2ecf20Sopenharmony_ci#define __STACK_FRAME_LOCAL(_num_params, _var_num) \ 368c2ecf20Sopenharmony_ci (112 + ((_var_num)*8)) 378c2ecf20Sopenharmony_ci#endif 388c2ecf20Sopenharmony_ci 398c2ecf20Sopenharmony_ci/* Parameter x saved to the stack */ 408c2ecf20Sopenharmony_ci#define STACK_FRAME_PARAM(var) __STACK_FRAME_PARAM(var) 418c2ecf20Sopenharmony_ci 428c2ecf20Sopenharmony_ci/* Local variable x saved to the stack after x parameters */ 438c2ecf20Sopenharmony_ci#define STACK_FRAME_LOCAL(num_params, var) \ 448c2ecf20Sopenharmony_ci __STACK_FRAME_LOCAL(num_params, var) 458c2ecf20Sopenharmony_ci#define STACK_FRAME_LR_POS 16 468c2ecf20Sopenharmony_ci#define STACK_FRAME_CR_POS 8 478c2ecf20Sopenharmony_ci 488c2ecf20Sopenharmony_ci/* 498c2ecf20Sopenharmony_ci * It is very important to note here that _extra is the extra amount of 508c2ecf20Sopenharmony_ci * stack space needed. This space can be accessed using STACK_FRAME_PARAM() 518c2ecf20Sopenharmony_ci * or STACK_FRAME_LOCAL() macros. 528c2ecf20Sopenharmony_ci * 538c2ecf20Sopenharmony_ci * r1 and r2 are not defined in ppc-asm.h (instead they are defined as sp 548c2ecf20Sopenharmony_ci * and toc). Kernel programmers tend to prefer rX even for r1 and r2, hence 558c2ecf20Sopenharmony_ci * %1 and %r2. r0 is defined in ppc-asm.h and therefore %r0 gets 568c2ecf20Sopenharmony_ci * preprocessed incorrectly, hence r0. 578c2ecf20Sopenharmony_ci */ 588c2ecf20Sopenharmony_ci#define PUSH_BASIC_STACK(_extra) \ 598c2ecf20Sopenharmony_ci mflr r0; \ 608c2ecf20Sopenharmony_ci std r0, STACK_FRAME_LR_POS(%r1); \ 618c2ecf20Sopenharmony_ci stdu %r1, -(_extra + STACK_FRAME_MIN_SIZE)(%r1); \ 628c2ecf20Sopenharmony_ci mfcr r0; \ 638c2ecf20Sopenharmony_ci stw r0, STACK_FRAME_CR_POS(%r1); \ 648c2ecf20Sopenharmony_ci std %r2, STACK_FRAME_TOC_POS(%r1); 658c2ecf20Sopenharmony_ci 668c2ecf20Sopenharmony_ci#define POP_BASIC_STACK(_extra) \ 678c2ecf20Sopenharmony_ci ld %r2, STACK_FRAME_TOC_POS(%r1); \ 688c2ecf20Sopenharmony_ci lwz r0, STACK_FRAME_CR_POS(%r1); \ 698c2ecf20Sopenharmony_ci mtcr r0; \ 708c2ecf20Sopenharmony_ci addi %r1, %r1, (_extra + STACK_FRAME_MIN_SIZE); \ 718c2ecf20Sopenharmony_ci ld r0, STACK_FRAME_LR_POS(%r1); \ 728c2ecf20Sopenharmony_ci mtlr r0; 738c2ecf20Sopenharmony_ci 748c2ecf20Sopenharmony_ci#endif /* _SELFTESTS_POWERPC_BASIC_ASM_H */ 75